Of course you can’t be a really first rate sci-fi pulp unless you have tube girls. I’m pleased to note that while the interior art got thinner over time, Imaginative Tales did go there on two of its covers. Here’s May 1957, done by Lloyd Rognan (1923-2005).
And exactly one year later, D. Bruce Berry (1924-1996).
Both the 1957 and the 1958 issues are available to read or download from the Internet Archive.
My original tumblr post was here. This cover image of the February 1956 issue Imagination Science Fiction was originally posted on Tumblr by pulpbizzare with the enigmatic (to me, anyway) text “3641-1852-10939.” It comes to us via Reginald Juice. The ISFDB entry for this issue is here, and identifies the artist as Lloyd Rognan.